BMS on eBay

I have had problems with BMS on my 12s LiFePo4 electric bike pack and I am looking at buying a bms with this eBay number ( 321048908605 )

The pack is driving a 350w motor so my arithmetic tells me watts divided by voltage equals amps so approximately 10amps is the theoretical figure for the BMS. Plainly I need to go a lot higher than that-perhaps a 36v 60amp BMS.

Something I am not sure of is the quality of these generic BMS-if they fail they can ruin expensive cells-are there quality reliable BMS available?
Thanks

Peter

Best Tech Power is good quality but I believe they require MOQ of two.
http://bestechpower.com/

BMS Battery
https://bmsbattery.com/66-bmspcm

https://www.electricbike.com/bmss-what-do-they-do/
http://www.avdweb.nl/solar-bike/electronics/bms.html

I dont know about these guys, my guess is they are shady, but search ES
https://www.greenbikekit.com/bms-pcm.html?SID=kn3ec908efnsapoduc52dnbpn3

These guys are good
http://www.pingbattery.com/lifepo4-bms/
http://www.batteryspace.com/PCB/BMS/CMB/UPS.aspx

Peter Brigg said:

The pack is driving a 350w motor so my arithmetic tells me watts divided by voltage equals amps so approximately 10amps is the theoretical figure for the BMS. Plainly I need to go a lot higher than that-perhaps a 36v 60amp BMS.

Click to expand...

Can your cells (and the internal and external battery wiring) handle 60A? If not, you sure dont want a BMS that can output that much.

You want a BMS that will limit current to at most whatever the max the cells and wiring can handle. ANy more than that and the cells and/or wiring can be damaged by pulling more current from them than they are designed for (if the motor/controller happens to be able to do so).